Potentially Critical Security Vulnerability16 March 2012

A potential security vulnerability has been discovered in the Windows
version of Bitcoin-Qt. If you are running Bitcoin-Qt versions 0.5
through 0.6 on Windows you should shut it down and upgrade to either
version 0.5.3.1 or 0.6rc4 NOW.

The command-line bitcoin daemon (bitcoind), Mac and Linux versions of
Bitcoin-Qt, and versions prior to 0.5 are not affected.

Due to the nature of the vulnerability, we believe it would be very
difficult for an attacker to do anything more than crash the
Bitcoin-Qt process. However, because there is a possibility of such a
crash causing remote code execution we consider this a critical issue.